WO2020132974A1 - Appareil de reconnaissance d'empreintes digitales et dispositif électronique - Google Patents

Appareil de reconnaissance d'empreintes digitales et dispositif électronique Download PDF

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Publication number
WO2020132974A1
WO2020132974A1 PCT/CN2018/124007 CN2018124007W WO2020132974A1 WO 2020132974 A1 WO2020132974 A1 WO 2020132974A1 CN 2018124007 W CN2018124007 W CN 2018124007W WO 2020132974 A1 WO2020132974 A1 WO 2020132974A1
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WO
WIPO (PCT)
Prior art keywords
micro
telecentric lens
lens array
fingerprint
microlens
Prior art date
Application number
PCT/CN2018/124007
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English (en)
Chinese (zh)
Inventor
蒋鹏
Original Assignee
深圳市汇顶科技股份有限公司
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by 深圳市汇顶科技股份有限公司 filed Critical 深圳市汇顶科技股份有限公司
Priority to PCT/CN2018/124007 priority Critical patent/WO2020132974A1/fr
Priority to CN201880003112.9A priority patent/CN109791612B/zh
Priority to CN201920290641.3U priority patent/CN209640876U/zh
Priority to PCT/CN2019/077370 priority patent/WO2020133703A1/fr
Priority to CN201980000384.8A priority patent/CN110337655B/zh
Publication of WO2020132974A1 publication Critical patent/WO2020132974A1/fr

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    • G—PHYSICS
    • G06—COMPUTING; CALCULATING OR COUNTING
    • G06V—IMAGE OR VIDEO RECOGNITION OR UNDERSTANDING
    • G06V40/00—Recognition of biometric, human-related or animal-related patterns in image or video data
    • G06V40/10—Human or animal bodies, e.g. vehicle occupants or pedestrians; Body parts, e.g. hands
    • G06V40/12—Fingerprints or palmprints
    • G06V40/13—Sensors therefor
    • G06V40/1318—Sensors therefor using electro-optical elements or layers, e.g. electroluminescent sensing
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B13/00—Optical objectives specially designed for the purposes specified below
    • G02B13/18—Optical objectives specially designed for the purposes specified below with lenses having one or more non-spherical faces, e.g. for reducing geometrical aberration

Definitions

  • the present application relates to the technical field of fingerprint identification, and in particular to a fingerprint identification device and electronic equipment.
  • the first one is based on periodic micro-hole array under-screen optical fingerprint recognition technology, this scheme has large light energy loss and long sensor exposure time; the other is based on micro-lens under-screen optical fingerprint recognition technology, this scheme The fingerprint distortion of the fingerprint recognition device is relatively large.
  • the embodiments of the present application provide a fingerprint identification device and an electronic device. Compared with the solution of the periodic through-hole array, the light loss in the vertical direction can be avoided, and the exposure time of the fingerprint sensor can be reduced. Compared with the micro lens solution, the fingerprint recognition device can also reduce the imaging distortion of the entire system. Therefore, the fingerprint recognition device of the embodiment of the present application greatly improves the imaging quality and contrast of fingerprint recognition.
  • a fingerprint recognition device including: a micro-telecentric lens array group for receiving an optical signal formed by reflection from a human finger; a fingerprint sensor provided under the micro-telecentric lens array group for Yu performs imaging based on the optical signal passing through the micro-telecentric lens array group.
  • the micro-telecentric lens array group includes: a dual-telecentric lens array for receiving the optical signal in a vertical direction; an object-side telecentric lens array, the object-side telecentric The lens array is arranged below the dual-telecentric lens array, and is used for collimating and focusing the optical signal transmitted from the dual-telecentric lens array, and transmitting the optical signal to the fingerprint sensor.
  • the dual-telecentric lens array includes a plurality of dual-telecentric lens units, and the dual-telecentric lens unit includes a first microlens, a second microlens, and the first microlens A first microaperture stop between the lens and the second microlens; and/or the object-side telecentric lens array includes a plurality of object-side telecentric lens units, and the object-side telecentric lens unit includes a third A microlens and a second microaperture stop disposed under the third microlens.
  • the first microaperture stop is disposed at a confocal plane of the first microlens and the second microlens, and/or the second microaperture stop is disposed At the image side focal plane of the third microlens.
  • the focal length of the first microlens and the focal length of the second microlens may be the same or different.
  • the diameter range of the first micro-aperture diaphragm is 20 ⁇ m to 1 ⁇ m, and the thickness range of the first micro-aperture diaphragm is 100 nm to 100 ⁇ m; and/or the second micro-aperture
  • the diameter of the diaphragm is 500 nm to 20 ⁇ m, and the thickness of the second micro-aperture diaphragm is 100 nm to 100 ⁇ m.
  • the thickness of the first micro-aperture diaphragm and/or the second micro-aperture diaphragm may be 500 nm.
  • the first micro-aperture stop includes a contra-top bi-conical hole, and a cone angle of the contra-top bi-conical hole and an angle of convergence of the edge light of the first micro lens It is the same, and/or the second micro-aperture stop includes a single-cone hole, and the angle of the cone angle of the single-cone hole is the same as the angle at which the edge rays passing through the third microlens converge.
  • the micro-telecentric lens array group includes spherical microlenses and/or aspheric microlenses.
  • the radius of curvature of the spherical microlenses in the micro-telecentric lens array group is 5 ⁇ m to 100 ⁇ m.
  • the focal length of the aspherical microlenses in the micro-telecentric lens array group is 5 ⁇ m to 2000 ⁇ m.
  • the distance between the dual telecentric lens array and the object-side telecentric lens array is less than or equal to 200 ⁇ m.
  • one pixel unit of the fingerprint sensor corresponds to at least one micro-telecentric lens group in the micro-telecentric lens array group, for example, if a micro-telecentric lens group includes a double telecentric For a lens unit and an object-side telecentric lens unit, one pixel of the fingerprint sensor corresponds to one or more micro-telecentric lens groups composed of a double telecentric lens unit and an object-side telecentric lens unit.
  • the object-side telecentric lens units in the object-side telecentric lens array may correspond one-to-one with the pixel units of the fingerprint sensor.
  • the dual-telecentric lens array and the object-side telecentric lens array may or may not correspond to each other.
  • a bi-telecentric lens unit can correspond to one or more object-side telecentric lens units, or an object-side telecentric lens unit can also correspond to multiple bi-telecentric lens units.
  • the device further includes: a filter plate, disposed above the fingerprint sensor, for filtering the optical signal formed by the reflection of the human finger.
  • the fingerprint identification device when the fingerprint identification device is applied to an electronic device with a display screen, the fingerprint identification device is fixed below the display screen, and there is a gap with the display screen.
  • the electronic device further includes a middle frame, and the fingerprint identification device is fixed on the middle frame.
  • a foam layer is provided below the display screen, and the foam layer has an opening at the installation position of the fingerprint identification device, so that the fingerprint identification device can receive The light signal transmitted by the display screen and formed by reflection of a human finger.
  • the arrangement manner of the micro-telecentric lens array group is a square or a hexagon.
  • microlenses in the micro-telecentric lens array group and the micro-aperture stop in the micro-telecentric lens array group and/or in the micro-telecentric lens array group are filled with any combination of the following transparent media: air, glass, and plastic.
  • air may be filled between the first microlens and the first microaperture stop
  • glass may be filled between the first microaperture stop and the second microlens.
  • the material of the microlenses in the micro-telecentric lens array group is glass or plastic, and/or the microlenses in the micro-telecentric lens array group are processed through a micro-nano process or pressed The mold process is realized.
  • the micro-aperture diaphragm in the micro-telecentric lens array group is manufactured through a micro-nano processing technology or a nano-printing technology.
  • an electronic device including a display screen and the fingerprint identification device in the first aspect or any possible implementation manner of the first aspect, and the fingerprint identification device is disposed below the display screen .
  • the electronic device further includes a middle frame, and the fingerprint identification device is fixed on the middle frame.
  • the distance between the fingerprint identification device and the display screen may be greater than or equal to 600 ⁇ m.
  • a foam layer is provided below the display screen, and the foam layer has an opening at the installation position of the fingerprint identification device, so that the fingerprint identification device can receive The light signal transmitted by the display screen and formed by reflection of a human finger.
  • the fingerprint recognition device can also reduce the imaging distortion of the entire system. The fingerprint recognition device can achieve higher imaging quality and contrast.
  • FIG. 1 shows a schematic block diagram of an application scenario of an embodiment of the present application.
  • FIG. 2 is a schematic block diagram of a fingerprint identification device according to an embodiment of the present application.
  • Fig. 3 shows an imaging principle diagram of an object-side telecentric lens.
  • FIG. 4 shows an imaging principle diagram of an image-side telecentric lens.
  • Fig. 5 shows an imaging principle diagram of a double telecentric lens.
  • FIG. 6 is a schematic block diagram of a micro-telecentric lens array group in an embodiment of the present application.
  • FIG. 7 shows a schematic structural diagram of a fingerprint identification device according to an embodiment of the present application.
  • FIG. 8 is an assembly structure diagram of a fingerprint identification device according to an embodiment of the present application.
  • FIG. 9 is a schematic block diagram of an electronic device according to an embodiment of the present application.
  • the fingerprint identification device provided in the embodiments of the present application can be applied to smart phones, tablet computers, and other mobile terminals or other terminal devices with display screens; more specifically, in the above terminal devices, the fingerprint identification device It may be specifically an optical fingerprint device, which may be disposed in a partial area or all areas below the display screen to form an under-display optical fingerprint system.
  • the terminal device 100 includes a display screen 120 and a fingerprint recognition device 130, wherein the fingerprint recognition device 130 is disposed below the display screen 120 Local area.
  • the fingerprint recognition device 130 may include a sensing array having a plurality of optical sensing units, wherein the sensing array may also be a fingerprint sensor.
  • the area where the sensing array is located or its optical sensing area is the fingerprint detection area 103 of the fingerprint identification device 130. As shown in FIG. 1, the fingerprint detection area 103 is located in the display area 102 of the display screen 120.
  • the terminal device 100 adopting the above structure does not need a special reserved space on the front of it to set fingerprint keys (such as the Home key).
  • the display screen 120 may be a display screen with a self-luminous display unit, such as an organic light-emitting diode (Organic Light-Emitting Diode, OLED) display screen or a micro light-emitting diode (Micro-LED) display screen .
  • the display screen 120 may be specifically a touch display screen, which can not only display images, but also detect a user's touch or pressing operation, thereby providing a human-computer interaction interface for the user.
  • the terminal device 100 may include a touch controller, and the touch controller may specifically be a touch panel, which may be provided on the surface of the display screen 120, or may be partially integrated or integrated as a whole Into the display screen 120 to form the touch display screen.
  • the fingerprint recognition device 130 may use the display unit (ie, OLED light source) of the OLED display screen 120 located in the fingerprint detection area 103 as an excitation light source for optical fingerprint detection.
  • the fingerprint identification device 130 may also use an internal light source or an external light source to provide an optical signal for fingerprint detection.
  • the fingerprint identification device 130 may be applicable to non-self-luminous display screens, such as liquid crystal display screens or other passive light-emitting display screens.
  • the fingerprint recognition device 130 may further include an excitation light source for optical fingerprint detection, the excitation light source It may be specifically an infrared light source or a light source with a specific wavelength and invisible light, which may be provided under the backlight module of the liquid crystal display or the edge area under the protective cover of the terminal device 100, and the fingerprint identification device 130 is arranged under the backlight module, and the backlight module allows the fingerprint detection light to pass through the liquid crystal panel and the backlight module through openings or other optical design of the film layers such as the diffusion sheet, the brightness enhancement sheet, the reflection sheet, etc. Reach the induction array of the fingerprint identification device 130.
  • the excitation light source It may be specifically an infrared light source or a light source with a specific wavelength and invisible light, which may be provided under the backlight module of the liquid crystal display or the edge area under the protective cover of the terminal device 100, and the fingerprint identification device 130 is arranged under the backlight module, and the backlight module allows the fingerprint detection light to pass through the liquid crystal panel and the backlight module through openings
  • the sensing array of the fingerprint recognition device 130 may specifically be a photodetector array, which includes a plurality of photodetectors distributed in an array, and the photodetectors may be used as the optical sensing unit as described above .
  • the sensing array of the fingerprint recognition device 130 may specifically be a photodetector array, which includes a plurality of photodetectors distributed in an array, and the photodetectors may be used as the optical sensing unit as described above .
  • the sensing array of the fingerprint recognition device 130 may specifically be a photodetector array, which includes a plurality of photodetectors distributed in an array, and the photodetectors may be used as the optical sensing unit as described above .
  • the fingerprint recognition device 130 may also be disposed in the entire area below the display screen 120, thereby extending the fingerprint detection area 103 to the entire display area 102 of the entire display screen 120, to achieve Full-screen fingerprint recognition.
  • the terminal device 100 may further include a transparent protective cover 110, and the cover 110 may be a glass cover or a sapphire cover, which is disposed above the display screen 120 and Cover the front of the terminal device 100. Therefore, in the embodiment of the present application, the so-called finger pressing on the display screen 120 actually means pressing on the cover plate 110 above the display screen 120 or covering the surface of the protective layer of the cover plate 110.
  • the fingerprint recognition device 130 may include a light detection part 134 and an optical component 132, the light detection part 134 includes the sensing array and is electrically connected to the sensing array
  • the connected reading circuit and other auxiliary circuits can be fabricated on a chip through a semiconductor process; that is, the light detection portion 134 can be fabricated on an optical imaging chip or an image sensor chip.
  • the optical component 132 may be disposed above the sensing array of the light detection portion 134, and the optical component 132 may include a filter layer, a light guide layer, and other optical elements; the filter layer may be used for The ambient light penetrating the finger is filtered out, and the light guide layer is mainly used to guide (eg, optically collimate or converge) the reflected light reflected from the finger surface to the sensing array for optical detection.
  • the light emitted by the display screen 120 is reflected on the surface of the finger to be detected above the display screen 120, and the reflected light reflected from the finger is optically collimated or concentrated by the micro-hole array or the lens unit, and then further After being filtered by the filter layer, the optical detection portion 134 receives the reflected light, and the optical detection portion 134 can further detect the received reflected light, thereby acquiring a fingerprint image of the finger to realize fingerprint recognition.
  • the position of the filter layer of the optical component 132 is not limited to below the light guide layer; for example, in an alternative
  • the filter layer may also be disposed between the light guide layer and the display screen 120, that is, above the light guide layer; or, the optical component 132 may include two filter layers, The two are respectively arranged above and below the light guide layer.
  • the filter layer may also be integrated into the light guide layer, or may even be omitted, which is not limited in this application.
  • the optical component 132 and the light detection part 134 can be packaged in the same optical fingerprint chip. It may also be installed inside the fingerprint recognition device as a relatively independent component from the optical detection portion 134, that is, the optical component 132 is disposed outside the chip where the light detection portion 134 is located, such as attaching the optical component 132 Above the chip, or integrate some elements of the optical assembly 132 into the above chip. There are various implementation solutions for the light guide layer of the optical component 132.
  • the light guide layer of the optical component 132 is specifically an optical path modulator or an optical path collimator made of semiconductor silicon wafers or other substrates (such as silicon oxide or nitride), which has Multiple optical path modulation units or collimation units.
  • the optical path modulation unit or collimation unit may be specifically a through hole having a high aspect ratio. Therefore, the multiple collimation units or lens units may constitute a through hole array.
  • the light incident on the optical path modulation unit or the collimating unit can pass through and be received by the optical sensing unit below it, and each optical sensing unit can basically receive the light passing above it.
  • the light guide layer may also include an optical lens (Lens) layer having one or more optical lens units, such as a lens group composed of one or more aspherical microlenses.
  • an optical lens (Lens) layer having one or more optical lens units, such as a lens group composed of one or more aspherical microlenses.
  • the sensor array of the light detection part 134 may specifically include only a single sensor array, or a dual sensor array (Dual Array) or multiple sensor arrays (Multiple Array) with two or more sensor arrays arranged side by side ) Architecture.
  • the optical component 132 may use a single light guide layer to simultaneously cover the two or more sensing arrays; alternatively, the optical component 132 may also include two or more light guide layers arranged side by side, such as two or more optical path modulators or optical path collimators, or two or more optical lens layers, the two or more light guide layers arranged side by side
  • the light layers are respectively arranged above the two or more sensor arrays, and are used to guide or concentrate the related reflected light to the sensor arrays below it.
  • the display screen 120 may also use a non-self-luminous display screen, such as a backlit liquid crystal display screen; in this case, the fingerprint recognition device 130 cannot use the display screen 120
  • the display unit is used as an excitation light source. Therefore, it is necessary to integrate an excitation light source inside the fingerprint recognition device 130 or set an excitation light source outside to realize optical fingerprint detection.
  • the detection principle is consistent with the content described above.
  • the fingerprint recognition device is taken as an example of an off-screen optical fingerprint recognition device
  • the fingerprint recognition device of the terminal device 100 may also use ultrasonic waves Fingerprint recognition devices or other types of fingerprint recognition devices instead. This application does not specifically limit the type and specific structure of the fingerprint recognition device, as long as the above fingerprint recognition device can meet the performance requirements for fingerprint recognition inside the display screen of the terminal device.
  • the fingerprint identification device 130 may use a periodic micro-hole array to transmit light to the sensing array. In this scheme, the light energy loss is large and the sensor exposure time is long.
  • the fingerprint recognition device 130 may use a micro lens to transmit light to the sensing array, and since an ordinary lens is used, during the imaging process, when the object distance changes, the size of the resulting image Changes will occur accordingly, which may result in lenses with the same focal length, corresponding to different object distances, having different magnifications.
  • ordinary lenses have a certain depth of field. When the measured object is not within the depth of field of the lens, the image will become blurred and cannot be clearly focused. As a result, the fingerprint recognition accuracy is not high.
  • the embodiments of the present application provide a new fingerprint recognition device, which can be disposed under the display screen.
  • the fingerprint recognition device 200 may include a micro-telecentric lens array group 210 and a fingerprint sensor 220, and the micro-telecentric lens array group 210 may be disposed above the fingerprint sensor 220.
  • the micro-telecentric lens array 210 is used to receive an optical signal formed by reflection of a human finger and in a vertical direction, and then collimate and focus the optical signal.
  • the fingerprint sensor 220 is used for imaging based on the optical signal passing through the micro-telecentric lens array group 210.
  • the so-called telecentric lens is essentially a combination of an ordinary lens and a small hole imaging principle. It can be within a certain object distance range, so that the resulting image magnification will not change, does not change with the depth of field, and there is no parallax. Applying it to fingerprint recognition technology can improve the accuracy of fingerprint recognition.
  • telecentric lenses can be divided into object-side telecentric lenses, image-side telecentric lenses, and dual telecentric lenses.
  • object-side telecentric lenses image-side telecentric lenses
  • dual telecentric lenses The principles of various telecentric lenses will be described below with reference to FIGS. 3 to 5.
  • Figure 3 shows the imaging principle of an object-side telecentric lens.
  • an aperture stop is placed at the focal plane of the image side of the ordinary lens.
  • the role of this aperture stop is to allow only parallel incident object rays (such as Ray 1 and Ray 2) to reach the image plane for imaging. From the geometric relationship, it can be seen that there is no relationship between near and far. That is to say, the object is at infinity.
  • Fig. 4 shows the imaging principle of an image-side telecentric lens.
  • an aperture stop is placed at the object-side focal plane of the ordinary lens so that the image-side chief rays (such as ray 1 and ray 2) are parallel to the optical axis, and the magnification and image distance of the image-side telecentric lens Irrelevant.
  • Fig. 5 shows the imaging principle of a double telecentric lens.
  • the dual telecentric lens combines the advantages of an object-side telecentric lens and an image-side telecentric lens. It is composed of two groups of lenses (such as lens 1 and lens 2).
  • the confocal surface of the two groups of lenses is equipped with an aperture stop, so that the main rays (such as ray 1 and ray 2) are both on the object side and the image side and the optical axis parallel.
  • the telecentric lens after the array miniaturization constitutes the micro telecentric lens array group 210 in the fingerprint identification device 200 provided by the embodiment of the present application.
  • the micro-telecentric lens array group can be a combination of various arrayed and miniaturized telecentric lens units.
  • the micro-telecentric lens array group 210 may include a dual-telecentric lens array 211 and an object-side telecentric lens array 212, and the object-side telecentric lens array 212 may be disposed on the dual-telecentric lens array 211 below, where the dual telecentric lens array 211 mainly receives the optical signal formed by the reflection of the human finger and receives the optical signal at a small angle in the vertical direction; and the object-side telecentric lens array 212 is used to The optical signal transmitted from the dual telecentric lens array 211 is collimated and focused, and the sensing array of the fingerprint sensor 220 can receive the optical signal transmitted from the object-side telecentric lens array 212 and perform imaging based on the optical signal.
  • the dual telecentric lens array 211 and the object-side telecentric lens array 212 are also miniaturized telecentric lenses.
  • the bi-telecentric lens array 211 may be composed of a plurality of bi-telecentric lens units, and as shown in FIG. 5, one bi-telecentric lens unit is composed of two microlenses and a micro-aperture stop, where the micro The aperture stop may be provided between two microlenses.
  • the object-side telecentric lens array 212 may be composed of multiple object-side telecentric lens units, and as shown in FIG.
  • an object-side telecentric lens is composed of a microlens and a micro-aperture diaphragm, where the The micro-aperture stop may be provided on the side where the micro lens forms an image.
  • the microlens array 1, microaperture diaphragm array 1, microlens array 2, microlens array 3, and micro The aperture diaphragm array 2 can reach the fingerprint sensor.
  • the microlens array 1, the microaperture diaphragm array 1 and the microlens array 2 constitute a dual telecentric lens array 211
  • the microlens array 3 and the microaperture diaphragm array 2 constitute an object-side telecentric lens array 212.
  • the micro-telecentric lens array group 210 may only be provided with a micro-aperture diaphragm array under the double-telecentric lens array. That is to say, after passing through the display screen, the optical signal formed by the reflection of the finger can pass through the microlens array 1, the microaperture diaphragm array 1, the microlens array 2 or the microlens array 3, and The micro-aperture diaphragm array 2 reaches the fingerprint sensor.
  • the micro-lens array 1, the micro-aperture diaphragm array 1 and the micro-lens array 2 constitute a dual telecentric lens array 211
  • the dual telecentric lens array is used to receive an optical signal formed by fingerprint reflection in the vertical direction
  • the stop array 2 is used to condense the light transmitted by the double telecentric lens array and transmit it to the fingerprint sensor.
  • the micro-telecentric lens array group is mainly composed of a micro lens array and a micro aperture diaphragm array. As for how it is implemented in combination with the three telecentric lenses in FIGS. 3 to 5, it is not specifically limited here.
  • air, glass, plastic, or any other transparent material is used to fill the microlens and the microaperture diaphragm and/or the microlens and the microlens, or the above-mentioned various Any combination of transparent materials.
  • transparent materials for example, between microlens array 1 and microaperture diaphragm array 1 in FIG. 7, between microaperture diaphragm array 1 and microlens array 2, microlens array 2 and microlens array 3, microlens array 3
  • the filling with the micro-aperture diaphragm array 2 may be the same or different.
  • all may be air, glass, or plastic.
  • the filling between the microlens and the microaperture stop may be different from that between the microlens and the microlens.
  • the microlens and the microaperture stop may be filled with air, and the microlens and the microlens may be filled with glass, which is not limited in this application.
  • the microlenses in the embodiments of the present application may be implemented by a micro-nano processing technology or a compression molding process, and the micro-aperture diaphragms in the embodiments of the present application may be manufactured by a micro-nano processing technology or a nano-printing technology, and then may Realize the miniaturization of telecentric lens array.
  • a dual telecentric lens unit is composed of two micro lenses and a micro aperture stop
  • an object-side telecentric lens unit is composed of a micro lens and a micro aperture stop.
  • the micro-aperture stop in the dual telecentric lens unit can be set at the confocal plane of the two micro lenses. That is to say, the focal points of the two microlenses coincide, and an aperture stop is inserted at the focal point to constitute a bi-telecentric lens unit.
  • the micro-aperture stop in the object-side telecentric lens unit is set at the image-side focal plane of the micro lens.
  • the focal lengths of the two microlenses in the bi-telecentric lens unit may be the same or different.
  • the two microlenses may be symmetric with respect to the confocal plane, that is, symmetric with respect to the micro-aperture stop. If the focal lengths of the two microlenses are different, the two microlenses may be asymmetric with respect to the confocal plane. In other words, the two microlenses are no longer symmetrical about the micro-aperture stop.
  • the micro-aperture diaphragm in the dual telecentric lens unit and the micro-aperture diaphragm in the object-side telecentric lens unit may have a certain thickness, then the micro-aperture diaphragm may be a cylindrical hole, It may not be a cylindrical hole.
  • the micro-aperture stop in the double-telecentric lens unit may be a contra-double-tapered hole, and the micro-aperture stop in the object-side telecentric lens array may be a single-cone hole.
  • both the top double-cone hole and the single-cone hole may be conical or triangular, which is not limited herein.
  • the embodiment of the present application does not specifically limit the thickness of the micro-aperture diaphragm, as long as it is smaller than the distance between the micro-aperture diaphragm and the microlens.
  • one micro-telecentric lens group in the micro-telecentric lens array group may correspond to one pixel unit of the fingerprint sensor.
  • the one micro-telecentric lens group may include a double telecentric lens unit and an object-side telecentric lens unit.
  • the object-side telecentric lens units in the object-side telecentric lens array may correspond to the pixel units of the fingerprint sensor in a one-to-one correspondence.
  • the dual-telecentric lens array and the object-side telecentric lens array may or may not correspond to each other.
  • one bi-telecentric lens unit may correspond to one or more object-side telecentric lens units, or one object-side telecentric lens unit may also correspond to multiple bi-telecentric lens units.
  • one micro-telecentric lens group in the micro-telecentric lens array group may correspond to multiple pixel units of the fingerprint sensor.
  • one object-side telecentric lens in the object-side telecentric lens array may correspond to four pixel units.
  • the pixel density of the fingerprint sensor can be doubled or higher, or the pixel unit of the fingerprint sensor has a shorter cycle than the telecentric lens unit.
  • a single pixel period needs to be related to the resolution requirements of the object.
  • a fingerprint recognition device installed under the display screen can set the pixel period of the telecentric lens to be along the plane X/Y direction of the display screen
  • Each sampling rate is 25 ⁇ m.
  • the fingerprint identification device adopts a telecentric lens to collect fingerprints on the area above the telecentric lens, and focus the light in the vertical area above to the pixel unit of the fingerprint sensor. And by miniaturizing and arraying telecentric lenses, fingerprint imaging within a certain distance can be achieved. Compared with the solution of the periodic via array, the light loss in the vertical direction can be avoided, and the exposure time of the fingerprint sensor can be reduced. Compared with the micro lens solution, the fingerprint recognition device can also reduce the imaging distortion of the entire system, and the fingerprint recognition device can achieve higher imaging quality and contrast.
  • the diameter of the micro-aperture diaphragm may range from 20 ⁇ m to 1 ⁇ m, and the thickness of the micro-aperture diaphragm may range from 100 nm to 100 ⁇ m, for example, The thickness may be 500 nm.
  • the diameter of its micro-aperture diaphragm ranges from 500 nm to 20 ⁇ m, and the thickness of its micro-aperture diaphragm can range from 100 nm to 100 ⁇ m.
  • the surface type of each microlens in the telecentric lens may be spherical or aspherical, that is, in a telecentric lens group composed of a double telecentric lens unit and an object-side telecentric lens unit
  • the surface type of the microlenses may be all spherical or aspherical, or one of them may be spherical or aspherical.
  • the radius of curvature of the spherical microlens may be some value between 5 ⁇ m and 100 ⁇ m.
  • the radius of curvature of the aspherical microlens changes with the central axis.
  • the focal length range of the aspherical microlens may be a certain value between 5 m and 2000 m, specifically, a certain value between 5 m and 500 m.
  • the distance between the dual telecentric lens array and the object-side telecentric lens array may be less than or equal to 200 ⁇ m.
  • it may be between 1 ⁇ m and 200 ⁇ m.
  • the distance between the dual telecentric lens array and the object-side telecentric lens array can be set to less than 50 ⁇ m.
  • the material of the micro-telecentric lens array group may be glass, plastic, or other transparent materials.
  • the arrangement mode of the micro-telecentric lens array group may be a square, such as a square or a rectangle, a hexagon, or any other form, which is not limited in the embodiments of the present application.
  • the fingerprint recognition device 200 of the embodiment of the present application may further include a filter, which is used to filter the optical signal reflected by the finger.
  • the filter can be located between the lower part of the display screen and the fingerprint sensor, for example, it can be arranged between the fingerprint sensor and the micro-telecentric lens array group.
  • the position of the filter is not limited to the micro-telecentric lens array group, but can also be set between the micro-telecentric lens array group and the display screen, that is, the micro-telecentric lens array group Above; or, may include two layers of filters, both of which are arranged above and below the micro-telecentric lens array group, respectively.
  • the filter can also be arranged inside the micro-telecentric lens array group, for example, between the dual-telecentric lens array and the object-side telecentric lens array, or even omitted. There are no restrictions on the application.
  • the filter can be used to reduce the undesired background light in the fingerprint sensing, so as to improve the optical sensitivity of the fingerprint sensor to the received light.
  • the filter can specifically be used to filter out the wavelength of ambient light, for example, near infrared light and part of red light. For another example, blue light or part of blue light.
  • human fingers absorb most of the energy of light with a wavelength below 580 nm. If one or more optical filters or optical filter coatings can be designed to filter light with a wavelength from 580 nm to infrared, the ambient light pair can be greatly reduced The impact of optical detection in fingerprint sensing.
  • the filter may be an infrared cut-off optical filter.
  • FIG. 8 shows a schematic structural diagram of a fingerprint identification device provided by an embodiment of the present application.
  • the fingerprint recognition device is applied to an electronic device (for example, a smart phone), as shown in FIG. 8, the lower surface of the protective cover 310 is attached to the upper surface of the display screen 320, and the fingerprint recognition device 330 may be fixedly disposed on the display Below the screen 320, the lower surface of the fingerprint recognition device 330 is soldered and fixed to the flexible circuit board 350. And there is a gap 390 between the fingerprint recognition device 330 and the display screen 320.
  • the fingerprint identification device 330 may be fixedly connected to a device easily removable inside the terminal device to be installed below the display screen 320, for example, the fingerprint identification device 330 may be installed on the middle frame 370
  • the lower surface, the middle frame 370 can serve as a fixing frame between the fingerprint recognition device 330 and the display screen 320, and the upper surface of the middle frame 370 can be attached to the edge portion of the lower surface of the display screen 320 through foam adhesive 360 Together.
  • the middle frame 370 is disposed between the display screen 320 and the back cover and is used to carry various internal components.
  • the internal components include but are not limited to batteries, motherboards, cameras, cables, various sensors, microphones, earpieces, etc. And other parts.
  • the fingerprint recognition device 330 and the display screen 320 are completely decoupled, which prevents damage to the display screen 320 when the fingerprint recognition device 330 is installed or removed.
  • the fingerprint recognition device 330 may also be installed between the display screen 320 and the middle frame 370 with a gap therebetween.
  • the fingerprint recognition device 330 may be installed on the upper surface of the middle frame 370.
  • the fingerprint identification device and the battery can coincide in the thickness direction of the electronic device, so that the placement of the fingerprint identification device is no longer limited.
  • the distance between the fingerprint recognition device 330 and the display screen 320 may be greater than or equal to 600 ⁇ m.
  • the safety distance between the fingerprint identification device 330 and the display screen 320 is satisfied, and no device loss will be caused due to vibration or falling.
  • the middle frame 370 can be specifically made of metal or alloy material, or even made of plastic material. In this case, the middle frame 370 can even be integrally formed with the frame of the electronic device.
  • the so-called integrated molding is the internal middle frame and the frame Is a whole.
  • the frame can be just a metal welt, or a metal-like coating can be applied to the middle frame.
  • the middle frame 370 may also be a composite middle frame. Taking a mobile phone as an example, the middle frame 370 includes an inner middle frame 1 and an outer middle frame 2, the inner middle frame 1 is used to carry mobile phone parts, and the outer middle frame 2 is inside.
  • the outer edge of the outer middle frame 2 is provided with a mobile phone button, and the inner middle frame 1 and the outer middle frame 2 are integrated into one. Because the middle frame of the mobile phone is designed as the inner middle frame and the outer middle frame, the inner and outer middle frames are integrated into a whole. When the mobile phone is impacted, the outer middle frame is first worn. Because there are only buttons on the outer middle frame, it is simple and convenient to replace the outer middle frame. Low cost; furthermore, an elastic material can be provided between the inner and outer middle frames. Since the inner and outer middle frames are relatively fixed under the compression of the elastic layer, the elastic layer can reduce the inner center when the outer middle frame is under impact The impact of the box.
  • a layer of foam can be provided under the display screen 320, and a sealed environment can be formed between the display screen 320 and the fingerprint recognition device 330, so as to meet the requirements of shading and dust prevention.
  • the foam layer can be opened at the installation position of the fingerprint recognition device 330, so that the fingerprint recognition device 330 can receive the optical signal transmitted through the display screen 320.
  • the finger When the finger is placed above the illuminated display screen 320, the finger will reflect the light emitted by the display screen 320, and this reflected light will penetrate the display screen.
  • the fingerprint is a diffuse reflector whose reflected light exists in all directions. Using a specific light path, the fingerprint sensor only receives light in the vertical direction, and the fingerprint can be solved by an algorithm.
  • An embodiment of the present application further provides an electronic device.
  • the electronic device includes the fingerprint identification device and the display screen in the foregoing various embodiments, and the fingerprint identification device is located below the display screen. Further, the electronic device further includes a middle frame, and the fingerprint identification device may be fixed on the middle frame.
  • FIG. 9 is a schematic block diagram of an electronic device 400 provided according to an embodiment of the present application.
  • the electronic device 400 shown in FIG. 9 includes: a radio frequency (Radio Frequency) circuit 410, a memory 420, other input devices 430, a display screen 440, a sensor 450, an audio circuit 460, an I/O subsystem 470, a processor 480, And power supply 490 and other components.
  • a radio frequency (Radio Frequency) circuit 410 included in FIG. 7
  • the structure of the electronic device shown in FIG. 7 does not constitute a limitation on the electronic device, and may include more or fewer components than the illustration, or combine some components, or split some components , Or different component arrangements.
  • the display screen 440 belongs to a user interface (User Interface, UI), and the electronic device 400 may include a user interface that is less than that illustrated or less.
  • UI User Interface
  • the RF circuit 410 can be used for receiving and sending signals during receiving and sending information or during a call.
  • the RF circuit includes, but is not limited to, an antenna, at least one amplifier, a transceiver, a coupler, a low noise amplifier (LNA), a duplexer, and the like.
  • the RF circuit 410 can also communicate with other devices through a wireless communication network.
  • the memory 420 may be used to store software programs and modules.
  • the processor 480 executes various functional applications and data processing of the electronic device 400 by running the software programs and modules stored in the memory 420.
  • the memory 420 may mainly include a storage program area and a storage data area, wherein the storage program area may store an operating system, application programs required by at least one function (such as a sound playback function, an image playback function, etc.), etc.; the storage data area may store The data created by the use of the electronic device 400 (such as audio data, phone book, etc.) and the like.
  • the memory 420 may include a high-speed random access memory, and may also include a non-volatile memory, such as at least one magnetic disk storage device, a flash memory device, or other volatile solid-state storage devices.
  • the other input device 430 may be used to receive input digital or character information, and generate signal input related to user settings and function control of the electronic device 400.
  • other input devices 430 may include but are not limited to physical keyboards, function keys (such as volume control buttons, switch buttons, etc.), trackballs, mice, joysticks, and light mice (light mice are touch sensitive that do not display visual output Surface, or an extension of a touch-sensitive surface formed by a screen, etc.).
  • the other input device 430 is connected to the other input device controller 471 of the I/O subsystem 470, and performs signal interaction with the processor 480 under the control of the other device input controller 471.
  • the display screen 440 may be used to display information input by the user or information provided to the user and various menus of the electronic device 400, and may also accept user input.
  • the specific display screen 440 may be a touch screen, and may include a display panel 441 and a touch panel 442.
  • the touch panel 442 can cover the display panel 441, and the user can according to the content displayed on the display panel 441 (the display content includes but is not limited to, a soft keyboard, a virtual mouse, a virtual key, an icon, etc.) Operate on or near the control panel 442, after detecting the operation on or near it, the touch panel 442 transmits it to the processor 480 through the I/O subsystem 470 to determine the user input, and then the processor 480 passes the I according to the user input
  • the /O subsystem 470 provides corresponding visual output on the display panel 441.
  • the touch panel 442 and the display panel 441 are implemented as two independent components to realize the input and input functions of the electronic device 400, in some embodiments, the touch panel 442 and the display panel 441 may be Integrate to realize the input and output functions of the electronic device 400.
  • the electronic device 400 may further include at least one sensor 450.
  • the sensor 450 may be a fingerprint sensor located under or within the display screen 440, that is, the fingerprint identification device in the embodiment of the present application.
  • the audio circuit 460, the speaker 461, and the microphone 462 may provide an audio interface between the user and the electronic device 400.
  • the audio circuit 460 can convert the received audio data converted signal to the speaker 461, which converts the speaker 461 into a sound signal output; on the other hand, the microphone 462 converts the collected sound signal into a signal, which is received by the audio circuit 460 Convert to audio data, and then output the audio data to the RF circuit 410 to send to another mobile phone, for example, or output the audio data to the memory 420 for further processing.
  • the I/O subsystem 470 is used to control input and output external devices, and may include other device input controllers 471, sensor controllers 472, and display controllers 473.
  • one or more other input control device controllers 471 receive signals from other input devices 430 and/or send signals to other input devices 430, which may include physical buttons (press buttons, rocker buttons, etc.) , Dial, slide switch, joystick, click wheel, light mouse (light mouse is a touch-sensitive surface that does not display visual output, or an extension of the touch-sensitive surface formed by the screen). It is worth noting that the other input control device controller 471 can be connected to any one or more of the above devices.
  • the display controller 473 in the I/O subsystem 470 receives signals from the display screen 440 and/or sends signals to the display screen 440. After the display screen 440 detects the user input, the display controller 473 converts the detected user input into interaction with the user interface object displayed on the display screen 440, that is, realizes human-computer interaction.
  • the sensor controller 472 may receive signals from one or more sensors 440 and/or send signals to one or more sensors 440.
  • the processor 480 is the control center of the electronic device 400, and uses various interfaces and lines to connect various parts of the entire electronic device, by running or executing the software programs and/or modules stored in the memory 420, and calling the stored in the memory 420
  • the data performs various functions of the electronic device 400 and processes the data, thereby monitoring the electronic device as a whole.
  • the processor 480 may include one or more processing units; preferably, the processor 480 may integrate an application processor and a modem processor, where the application processor mainly processes an operating system, a user interface, and application programs, etc.
  • the modem processor mainly handles wireless communication. It can be understood that the foregoing modem processor may not be integrated into the processor 480.
  • the processor 480 may be used to execute various steps in the method embodiments of the present application.
  • the electronic device 400 further includes a power supply 490 (such as a battery) that supplies power to various components.
  • a power supply 490 (such as a battery) that supplies power to various components.
  • the power supply can be logically connected to the processor 480 through a power management system, so as to realize functions such as charging, discharging, and power consumption management through the power management system.
  • the electronic device 400 may further include a camera, a Bluetooth module, etc., which will not be repeated here.
  • circuits, branches, and units may be implemented in other ways.
  • the branch described above is schematic.
  • the division of the unit is only a logical function division. In actual implementation, there may be other divisions.
  • multiple units or components may be combined or integrated into A branch, or some features can be ignored, or not implemented.
  • the integrated unit is implemented in the form of a software functional unit and sold or used as an independent product, it may be stored in a computer-readable storage medium.
  • the technical solution of the present application essentially or part of the contribution to the existing technology or part of the technical solution can be embodied in the form of a software product, and the computer software product is stored in a storage medium, including Several instructions are used to enable a computer device (which may be a personal computer, server, or network device, etc.) to perform all or part of the steps of the methods described in the embodiments of the present application.
  • the aforementioned storage media include: U disk, mobile hard disk, read-only memory (Read-Only Memory, ROM), random access memory (Random Access Memory, RAM), magnetic disk or optical disk and other media that can store program code .

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  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Human Computer Interaction (AREA)
  • Multimedia (AREA)
  • Theoretical Computer Science (AREA)
  • Optics & Photonics (AREA)
  • Image Input (AREA)

Abstract

Un mode de réalisation de la présente invention concerne un appareil de reconnaissance d'empreintes digitales et un dispositif électronique, l'appareil de reconnaissance d'empreintes digitales comprenant : un groupe de réseaux de lentilles microtélécentriques, qui sert à recevoir des signaux lumineux formés par réflexion de doigts humains ; un capteur d'empreintes digitales, agencé au-dessous du groupe de réseaux de lentilles microtélécentriques et utilisé pour une imagerie fondée sur les signaux lumineux traversant le groupe de réseaux de lentilles microtélécentriques. Par rapport à un système de réseau périodique de trous traversants, le dispositif de reconnaissance d'empreintes digitales et l'appareil électronique du mode de réalisation de la présente invention peuvent éviter une perte de lumière dans la direction verticale et peuvent ensuite réduire le temps d'exposition du capteur d'empreintes digitales. Par rapport à un système de microlentilles, l'appareil de reconnaissance d'empreintes digitales peut également réduire la distorsion d'imagerie du système entier. L'appareil de reconnaissance d'empreintes digitales peut également améliorer la qualité et le contraste d'imagerie.
PCT/CN2018/124007 2018-12-26 2018-12-26 Appareil de reconnaissance d'empreintes digitales et dispositif électronique WO2020132974A1 (fr)

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Application Number Priority Date Filing Date Title
PCT/CN2018/124007 WO2020132974A1 (fr) 2018-12-26 2018-12-26 Appareil de reconnaissance d'empreintes digitales et dispositif électronique
CN201880003112.9A CN109791612B (zh) 2018-12-26 2018-12-26 指纹识别装置和电子设备
CN201920290641.3U CN209640876U (zh) 2018-12-26 2019-03-07 指纹识别装置和电子设备
PCT/CN2019/077370 WO2020133703A1 (fr) 2018-12-26 2019-03-07 Dispositif de reconnaissance d'empreinte digitale et appareil électronique
CN201980000384.8A CN110337655B (zh) 2018-12-26 2019-03-07 指纹识别装置和电子设备

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